| Current (2) |
| Founder | 1990 |
| Chief Executive Officer | 2020 |
| Former (17) |
| Chief Executive Officer | 1990 – 1999 |
| Audit | 1990 – 1990 |
| Deputy | 2015 – 2019 |
| Deputy | 2011 – 2015 |
| Chief Executive Officer | 2019 – 2020 |
| Management | 1990 – 1993 |
| Management | 2009 – 2012 |
| Chief Executive Officer | 2008 – 2010 |
| Management | 1999 – 1999 |
| Chief Executive Officer | 2010 – 2010 |
| Deputy | 2002 – 2011 |
| Management | 2010 – 2011 |
| Chief Executive Officer | 2014 – 2019 |
| Deputy | 1990 – 1998 |
| Chief Executive Officer | 2010 – 2010 |
| Chief Executive Officer | 2006 – 2008 |
| Chief Executive Officer | 2010 – 2014 |